Road grader



July 194% F. E.' ARNDT 2,247,464

y ROAD GRADER u v Filed Feb. 2, 1953 5 sheets-sheet 1 July l, 1941. F E.ARNDT 2241464 ROAD GRADER Filed Feb. 2, 1953 5 sheets-sheet 2 e7 89 A/a/ F. E. ARNDT July l, 1m.,

ROAD GRADER Filed Feb. 2, 1935 5 Sheets-Sheet 3 F. E. ARN DT july l,1941'.

` ROAD GRADER F. E. ARNDT ROAD GRADER July n, w41.

, 1935 5 Sheets-Sheet 5 Filed Feb. 2

Patented July l, 1941 ROAD GRADER Franklin E. Arndt, Galion, Ohio,assigner to The Galion Iron Works and Manufacturing Company, acorporation of Ohio Application February 2, 1933, Serial No. 654,901

20 Claims.

My invention relates to road building apparatus and one of its objectsis the provision of improved and efficient fluid-pressure motormechanism for effecting various adjustments in a road grading machine.

Ano'ther object of the invention is the provision of improved andemcient self-contained power-operated mechanism for moving a mold vboard in a-road grading machine from a hori- Zontal position :to a :highlift or bank sloping position.

A further object of the invention is the provision of improvedadjustable connections between the rear end of lthe drawbar and the rearportion of the supporting framework in a road grading machine to enablethe extent of lateral shift of the mold board to be increased.

Another object of the invention is the provision of improved connectingmechanism in a road grading machine between the drawbar and thesupporting framework to strengthen the support of the mold board whenoperating in bank sloping position.

Another object of the invention is the provision of fluid-pressureoperated mechanism for shifting a mold board laterally relatively to thesupporting framework in a road grading machine.

A further object of the invention is the provision of improvedfluid-pressure steering mechanism for a vehicle, particularly in a roadgrading machine.

Another object of the invention is the provision of improved sup-portingmeans for flexible huid-pressure hose adjacent the steering post of 1"Another object of the invention is the provision of open frameworkcombined with supporting and adjusting mechanism for a mold board in aroad grading machine to enable the operator rto view 'at all times theaction of the vmold board `on the road surface.

A further object of the invention is the pro- V vision of meansv forvarying the elevation of the front end of the drawbar in a road gradingmachine relative to the framework thereof to assist in adjusting theelevation of the mold board when in horizontal position and to affordample clearance between the mold bpard and the framework when the moldboard is ,moved to a bank sloping position.

Other objects of the invention will appear hereinafter, the novelfeatures and. combinations being set forth in the appended claims.

In the accompanying drawings, Fig. 1 is an elevation of a road gradingmachine embodying my improvements;

Fig, 2 is a `plan view of the structure shown in Fig. 1;

Fig. 2a is a perspective view of the latch mechanism embodied in theconnections between the rear` end of the drawbar and the rear portion ofthe machine frame;

Fig. 3 is a rear elevation of the machine shown in Fig. 1;

Fig. 4 is an elevational View, partly in section, taken on the line 4 4of Fig. 1 looking in the direction of the arrows;

Fig, 5 is a plan View of the machine shown in Fig. 1 with the mold;board shifted to its maximum extent from one side of the machine;

Fig. 6 is a diagrammatic front elevational View of the mold boardsupporting mechanism shown in plan in Fig. 5;

Fig. 7 is a plan view of the road grading miachine with the mold boardadjusted to its bank sloping position;

Fig. 8 is a diagrammatic front elevational view of the supportingmechanism for the mold board when in bank sloping position;

Fig. 9 is a diagrammatic view of the pump and hydraulic. motors and thepiping therefor; and

Fig. 10 is a view representing the internal combustion engine connectedto a hydraulic pump.

The machine shown in Figs. 1 and 2 comprises the vehicle frame I Imounted on the front wheels I2, I2 and rear wheels I3, I3. The frame IIcomprises longitudinal spaced-apart beams I4, It which are rigidlyconnected by the tubular cross-pieces I5, I6, Il and I8.

As shown in Fig. 4 the forward ends o f the beams I4, I4 are connectedby a U-shaped yoke I9 which rests upon a supporting frame *20 havingdepending channel irons 2|, 2I secured at their lower ends to theaxle-tree 22 on the ends of which are pivoted ai; 23, 23 the axles forthe front wheels I2, I2. These axles are provided with vertical arms 24,I2li to the upper ends of ser 2s at s4', ss'.

which is pivoted the cross-piece 25. Between one of the channel irons 2|and one of the arms 24 is pivotally connected a hydraulic motorcomprising a cylinder 26 and a piston rod 21. The cylinder 26 is pivotedat 26 to one of the channel irons 2l and the piston rod 21 is pivoted at28 to the remote vertical arm 24. As hereinafter explained, thehydraulic motor comprising the cylinder 26 is double acting in that theliquid flows into and out of the cylinder on both sides of the pistontherein and therefore when the leaning of the wheels I2 is adjusted,they may be locked in adjusted position by closing the Valve controllingthe flow of the liquid in the cylinder 26. v

Figs. 1 and 2 illustrate a pull type grader having a vehicle tongue 29secured at 39 to the vertical post 3|, the upper end of which isjournaled at 32 to the frame 29 and the lower end of which is journaledat 33 to the front axle-tree 22.

A cross-piece 34 secured to the tongue 29, as shown in Fig. 2, providesat its ends pivotal supports at 35, 36 for the cylinders 31V, 38 ofhydraulic motors comprising piston rods 31', 38',

the rear ends of which are pivoted at 49, 4I to the front aXle-tree22.While in some instances one double acting hydraulic motor comprising acylinder, a piston,'and'a piston rod may be employed, I prefer to usetwo hydraulic motors symmetrically arranged as shown in Fig. 2.

As shown in Figs. 1 and 2, a cross-plate 42 is secured to the uppersides of the forward ends of the side beams I4, I 4 and secured to thisplate 42 and depending therefrom is a vertical fixed bearing rod 43, thelower end of which'is provided with a retaining cap 44 as shown in Fig.4. When the hydraulic steeringmechanism is operated the frame 29 turnson a vertical axis at the center of the bearing 43.

Secured to the bottom of the plate 42 concentric with the bearing rod 43is a gear housing 44. When the rcrank 45 is operated, worm gearing onshaft 45 and in the housing 44 turns the screw 46 in the nut 41 to whichis pivoted at 48, 48

the yoke 49 which in turn is journaled at 58 to the front end of thedrawbar 5I; It will thus be seen' that by turning thexcrank 45 the frontend of the drawbar may be elevated or lowered relative to the frontv endof the main frame 4I I;

Secured to the top of the plate 42 is a socket 52 in which is mounted avertical post 53` which may be held rigidly in vertical position bylateral braces one of which is shown at 54 in Fig. 1 secured toone ofthe beams I4.

To the top of the post 53 is swivelled at 55 a connecting member 56 theforward end of which is pivoted at 51 to a supporting plate 58. Theforward end of the plate 58 is secured by means 4of the loop 59 to aspring 68 which is connected at its front end to the tongue 29, Clips6I, 6I

- are relied on to secure the four flexible conduits 62, 63 and 64, 65to the plate 58. The conduits 62, 63 are-connected to the ends of thecylinders 31 and 38 at 62', 62 and-63', 63. The conduits 64 and 65 areconnected to the ends of the cylin- Mounted on a cross-piece 66 on theforward portion of the frame II are two valves 61 vand 68, the valve 61controlling the ow of liquid in the conduits 64 and 65 and the valve 68controlling the flow of Vliquid in the conduits'62 and 63, The valves 61and 68 are connectedrby means `of universalY joints 69 and 1I) tolongitu- CII portion of the frame where they are connected by means ofuniversal joints one of which is shown at 13 in Fig. 1, to operatingcranks each movable along a gauge secured to the framework 14 at theoperators platform 15 The crank 16 may be connected to the rod 12 foractuating the Valve 68 which controls the steering of the machine. Asshown in Fig.V 3 thecrank 16 is associated with the gauge 11,'the endsof which may be provided with limit stops 18, 18 which indicate wideopen positions of the valve 68. In a similar manner the crank 19 may beconnected to the rod 1I for actuating the Valve 61 to control theleaning of `the front wheels I2. The crank 19 may be associated with thegauge 88 which is provided with limit stops 8|, 8| to indicate thewide-open positions of the Valve 61.

It should be particularly understood that the leaning of the frontwheels by means of the hydraulic motor mechanism shown in Fig. 4 may betaken advantage of to cooperate with the steering of the machine bymeans ofthe front wheels, to counteract the tendencyof the, mold-boardduring operation along the road surface'to shift the front end of themachine sidewise,` For instance, if the mold-board is in theposition-shown in plan in Fig. 2, the tendency will be during operation,for the front endof Vthe Vmachine to be shifted laterally to that sidewhere thefrontend of the mold-board is located. By leaning the tops ofthe front wheels toward the4 right as viewed in Fig. 4, the lower` edgesof the `rims of the front wheels will be in positions `to digjor cutinto the roadwayAand Vcounteract the v-tendencyfof the mold-board toAshift thefrontend of the machine sidewisef- Furthermore, by means ofthe hydraulic motors 31,7387 thefront Wheels may be steered toward ltheleft as viewed by the operator at the rear end-ofthe machine and thusassist the leaning of the front wheels in counteracting the tendencylof-themold-board to. shift the front end of the machine sidewise.Moreover, the operator at his single station at the rear end of themachine has under his direct observation, the operation of the.mold-board and the steering of the machine and the VVarious adjustmentsmay be made by theoperator so asto effect locking of the Various partsin adjusted positions including the front wheels, thereby greatlylessening the tendency of the front wheels as a unit to swerve sidewiseYonA the .Vertical axis 32, the hydraulic motors 31, 38 beinginlveryecient positions to resist swerving of theffront Wheel unit on,the axis32evenwhen one wheel or the otherrides over` an obstructionorirregularity in the roadway. l, v l l,

Secured rigidly to the rear ends ,of `thelongitudinal beams I4, is across supporting'structure 82 comprising angle irons 83, 83 as=shown inFig. 3 and the cross-piece 84 shown in Fig. 2.` VGuides are providedat.85, 86 for the transversevmembers 81, 81 of the rear wheel supportingframe, The axles88, 88 for the rear wheels I3,v I3 are pivoted at 89, 89to the en dsofvthe frame 81. Secured to the rear wheel axlesiarevertical crank arms 98, 99 the upper. end Ogf Whichv are pivotedat 9|,9| to the'cross-piece 92. A A

A vertical bracket iplate 93 is, secured tothe frame 81 and toits..1.lpl0er,end at 94 is pivoted a cylinder 95 of a hydraulic motorcomprising a piston rod 96 the outer end of Which is pivoted at 9| tothe upperend of `the crank arm 96 at the dinal rods 1I .and.12 whichextend'toglthe rear 75 left-hand side of the Vmachine as Viewed from therear (Fig, 3). Theliydraulic motor comprising the cylinder 951is doubleAacting'in thatthe the frame 81.

liquid flows to and from the cylinder 95 on both sides of the pistontherein and the controlling valve is such that when it is closed thecrank arms 90, 90 will be locked in adjusted positions. The leaning ofthe rear wheels may therefore be adjusted by means of the hydraulicmotor comprising the cylinder 95 and locked in adjusted position.

In order to shift the rear end of the frame II relatively to the rearwheels, a hydraulic motor comprising a cylinder 91 is pivoted at 98 to abracket 99 which is secured to the frame 81. The piston rod which is`connected to the piston that moves in the cylinder 91, is pivoted atits outer end at IOI to a gear wheel |02 meshing with the rack bars |03and |04. The upper rack bar |03 is secured to the machine frame and thelower rack bar |04 is Vsecured to It can readily be seen that when thepiston in the cylinder 91 is locked, the rack bars |03 and |04 arerelatively stationary and therefore the gearwheel |02 is locked againstrotation. The hydraulic motor comprising the cylinder 91 is doubleacting and controlledjby valve mechanism so that when the piston rod |00is moved relatively to the cylinder 91, the rear end of the main framewill be shifted laterally relatively to the rear Wheels |3, by the gear|02 rolling on the rack |04 and driving the rack I 03. When the pistonin the cylinder 91 is locked, the pivotal axis at |0| will be stationaryrelative to the cylinder 91. The rack bars |03 and |04 will notinterfere at anytime with the operation of the rear wheel leaningmechanism because when the vertical arms 9|) are rccked in eitherdirection the racks |03 and |04 will remain stationary.

Referring now to the road working implement comprising a mold board orscrapper |05 and the structure for supporting the same, it will be seenthat the drawbar 5| comprises spacedapart members |06 and |01 whichdiverge rearwardly andhave secured to the rear portions thereof asupporting circular guide |08 for supporting and guiding the circleframe |09 on which the mold board |05 is mounted. By

means of gearing I|0 connected by shafts and universal joints I I2, tothe wheel I I3 at the operators station, the circle |09 and the moldboard |05 may be adjusted angularly relative to the path of travel ofthe road grading machine,

By` means of the pull handle `||4 connected by the rod I|5 to the latchmechanism ||6, the

4tion, which apparatus is self-contained vand power-operated so that theactual work necessary to move the mold board to the desired adjustedpositions is done by power-operated mechanism under thecontrol of theoperator.

It should be understood that the circular guide frame |08 is rigidlysecured to the longitudinal members |06 and |01 of the drawbar 5| andtherefore this circular frame |08 moves bodily with the drawbar and themold board" `member |6| thereof.

ceiving the latch mechanism |63. circular frame comprising thecross-piece |60 |05 moves bodily with the guide frame |08 and thedrawbar 5|.

To the diametrically opposite sides of the circular guide frame |08 areconnected by means of universal joints II1 and ||8 the lower ends `oiextensible hanger rods ||9 and |20.

" length of the hanger has been adjusted. While in Fig. 1 I have madeprovision for two different lengths of the hanger I9 it should beunderstood that there may be more than two holes |23 if desired.

The upper ends of the hangers ||9 and |20 are connected by means of theuniversal joints |24 and |25 to the crank arms |26 and |21 which extendlaterally from the longitudinal rockshaits |28 and |29. The rockshaftsare mounted in suitable bearings |30, |3| and |32, |33 on the tops ofthe beams I4, I4 and spaced above the same a suflcient distance toafford ample clearance between the cranks |26 and |21 and the main frameII when such cranks are swung downwardly.

To the rear ends of the rockshafts |28 and |29 are connected thelaterally extending crank arms |34', |34 which are connected at theirouter ends by means of universal joints |35, |36 to the upper ends ofthe piston rods |31, |38 which extend downwardly into the cylinders |39and |40 of hydraulic motors mounted on opposite sides of the rearportion of the frame II as shown in Fig. 2. The lower ends of thecylinders |39 and |40 are pivoted at |4I, |42 to brackets |43 dependingfrom the beams I4.

The hydraulic motors comprising the cylinders |39 and |40 are preferablydouble acting and provided with valves for controlling the flow ofliquid to and from the cylinders on opposite sides of the pistonstherein. Consequently when the mold board has been adjusted it may belocked in adjusted position to prevent undue vibration thereof duringroad working or bank cutting operations.

The mold board may be shifted laterally relatively to the frame II bymeans of the hydraulic motor comprising the cylinder |44 and theconnections between the same and the rear end of the drawbar 5|. Theupper end of the cylinder |44 is pivoted at |45 to a bracket |46 mountedon the cross-tube |1 as shown in Figs. 1 and 2. IIhe piston rod |41 isconnected to a rack bar |41' which is guided by a roller |48 and whichmeshes with the pinion |49 secured to a shaft journaledin thecross-piece |50. Thelower end of this shaft is secured to a gear |5which meshes with the transverse rack bar |52. The rack bar |52 issupported by and guided along the transverse rail |52 secured to thelower sides of the beams I4 as shown in Fig. l.

`Between a pair of lugs |53 is pivoted at |54 on a horizontal axis, aclevis |55 and the latter is pivoted on an upright axis to a rod |56which is adapted to slide in a longitudintl guide |51 onv the bottom ofthe plate |58. The plate |58 is pivoted at |59 to the cross-piece |60 ofa semicircular frame, at the center of the arcuate This arcuate memberis providedwith four or more notches |62 for re- The semii in Fig. 2a. Y

:andthe-'arcuate member ISI, is pivoted at 1164,

|55 to the rear ends of the members |56 andi |01 -of the drawbar 5|.

The latch mechanism |63 is shown in perspective in Fig. 2a. On top ofthe rear end of the `5 plate |58 is secured a guide framel |66comprising fixed guide blocks |81, |68 along which is The handle isframe |85, and a collar |13 on theouter end of therod holds the spring|1| in the position shown '.It yshould be understood' that no labor:need be lexercised bythe operatorpin shifting the` moldfboardlaterally. 'Ihe latch |69 may be easily released manually by pulling thehandle Y|111V rearl wardly. Then by operating the hydraulic motorcomprising the cylinder |44, the latch mechanism may be movedtransversely of the frame of"the,125n y rEach .motor r1s, independently.controlled so that v thecrank yarm |26jmay be moved through a smallmachine until the latch |69 is snapped-into'the next notch by the springI'H. By again releasing the latch the rack bar |52 may beshifted byhydraulic lpower until the latch snaps into the lastnotch, whereupon therear end ofY the draw-f 30.

barhwill be rigidly connected to the rack bar |52. Then upon reversingthe hydraulic motor comprising the cylinder i 44, the latch mechanismwill effect movement .of the mold board laterally to its maximum extentwhen the piston in the cylinder |44 reaches the limit of its stroke.

The hydraulic motor |44 being double acting, the shifting gearing willbe locked in adjusted position when the valve connected to the cylinder|44 is closed. The connections between the rear end' 40V of the drawbarand the hydraulic motor |44 are such asto securely hold the mold boardin adjusted lateral position. It should be understood that the moldboard by reason of the plurality of the notches |82 may be adjusted to acorrespond-i 4.3`

l o n suitable supporting framework at the rear end ing plurality oflateral positions on either side of the frame of the machine.

Fig. 5 is a plan view of the road grader with the mold board adjusted toone of its extreme lateral positions While horizontal, as shown in Fig.6,1

the latter being a diagrammatic front elevational l view to show therelative positions of the front and rear wheels when adjusted as shownin Fig. VV5 and the relative positions of the hangers and the frontcrank arms |26 and |21. yAs shown in"55 Fig. 6 kthe tubular member |14may be longer than the tubular member |15 so that the hangers H3. and|25 may be extended to different 'lengths to facilitate lateral shiftingof the mold .i lugs |53 and |53" secured to the. rack bar |52` n whenthe :mold

near the ends of the latter. board is about to be shifted to theright-hand sidelof the machine as shown in Fig. 5 the slide rod`|56 isconnected -to the lugs |53, Whereas if the mold board isabout to beshifted to the left, 70

. hand side of the machine, the slide rod |56 is connected to the lugs|53. This adjustment may easily be made by releasing the latch |63 andswinging the plate |58 on its pivot |59, it .I being understoodthat allof the labor necessary; 75.

l lever |82 (Fig. 3). .|84 are similarly connected to valves 2||, 2|2

tonshiit-themo1d; board .1 laterally is performed bythe hydraulic motor|44.

inasmuch as itis desirable to use the shorter tubesjmay behdetachable'at the universal joints |24 and |25 and therefore are interchangeable.

Foruinrstance, the tubes |14 and |15 may be eX- changed whenrthc moldboard is to be moved to the left-handside of the machine and then uptQxflUlglQmflg .Positionhg- Aftershiftingjhe `mold board to its extremelateralposition such as that shown in Fig. 5, the

1 atcjlkv |83 is retained in position and the hydraulicmotor |44 islocked. By releasing the pins in thetubes .|314 and |15, the crank arms|26 and |2l1may beadjuste'd by the hydraulic motors |39.andl'|40.unti1.the" hangers I l and |28 are adjusted to. they desiredlengths and the pins. |23 re'lfinserted Vto hold the hangers at theadjusted lengths.-` 'Ihen by operating the motors |39 and Y|4|l .inopposite directions the crank arms |25 and |21 may each be rotated in ananti-clockwise direction` as rvievved from the operators station.

angle fromthe position shown in Fig. 6 to the po- .sition shown in Fig.8 and the crank arm |21 the connections `between the rear end of thedrawbar and the machine or vehicle frame, to

.hold the mold board in rigid adjusted position relative to the machineframe. This position is h preferably such as to direct the materialVthat is cut fromV the bank, tothe space between the paths of travel ofthe rear Wheels, as shown in Fig. 8. However, the mold board may beshifted to a still higherkposition to direct the material outside of thepath of the adjacent rear wheel.

The internallcombustion engine |18 4and the pump Y|11 to which it isconnected, are mounted of the beams I4, |4, as shown in Figs. 1 and 3.The fluid-'pressure medium such as oil is drawn from the supply tankV|13 by the pump |11 and forced through the various pipes or conduitsshown in Fig. 9. The valves for the respective Y hydraulic motors areeach located adjacent the same andoperated by connections extending tooperating levers Within reach of the operator on the platform 15 at therear end of the machine.

. The rear leaning Wheel motor 85 is provided with a valve |19 operableby the connections |88 to the actuating lever |8| (Fig. 1). In a similarmanner the rear shifting motor 91 may be controlled by a valve-283connected to the operating The operating levers |83 and whichv controlthe mold board tilting motors |39 and |48. Y`By means. of the lever |85and the connections between the same and the valve |85,

the drawbar shifting motor |44 may be con- 'lOllfL Y -f The operation ofthe various adjustments by means of'thehydraulic motors may best beund'erstood by referring to the piping diagram in Fig; 9. When thevehicle tongue 29 is in its fcent'ral position sho-wn in Fig. 2 and itis desiredv to turn the front axle-tree 22, the motors and 38 areoperated in opposite directions. By means of ,the lever 16 (Fig. 3) thevalve 68 may be moved to its full line position shown in Fig. 9.

The engine |16 is intended to be operated to continuously drive the pump|11. Liquid will be Withdrawn from the supply tank |18 through thesuction pipe |81 by the pump |11, and forced by the latter through theconduits |88, |89, |90, through the valve 88 into the pipe 62 and thenceinto the steering cylinder 31 back of the piston therein, and throughthe pipe |9| into the steering cylinder 38 ahead of the piston therein.When the pistons in the cylinders 31 and 38 move in opposite directions,liquid Will be forced therefrom through the conduits |92 and 63 andthence through the valve 68 into the pipes |93, |94, back to the supplytank |18. When the valve 68 is closed the pistons in the cylinders 31and 3B Will be locked against movement in either direction. When thevalve 68 is moved to its dotted line position the ovv to and fromY thecylinders 31 and 38 will be reversed and consequently the irontaxle-tree 22 Will be vturned in the opposite direction.

By means: of the lever 19 (Fig. 3) the valve 61 may be opened to thefull line position shown in Fig. 9, whereupon liquid will be' forcedfrom the pipe |90 through the valve 61 into the pipe 64 and thence intothe front wheel leaning cylinder 26 on that side of the piston thereinto Which the piston rod 21 is connected. The piston will move to drawinwardly the piston rod and the liq'uid Will be forced out of the rearend of the cylinder 26 into the pipe 65 and through the valve 61 intothe pipe |91 and thence through the pipes |93 and |94 back to the tank|18. By moving the valve 61 to its dotted line position the operation ofthe motor 26 may be reversed. By closing the valve 61 `the piston rod 21will be locked in adjusted position `against movement in eitherdirection. By means of the motor 26 the leaning of the front Wheels |2may be adjusted and locked in adjusted position.

The leaning of the rear Wheels I3 is adjusted by means of the motor 95which is controlled by the valve |19 to which the lever |8| (Figs. 1 and3) is connected. When the valve |19 is in its full line position asshown in Fig. 9 liquid will be forced from the pump through the pipe |98and valve |19 into the pipe |99 back o-f the piston in the cylinder 95.At the same time the liquid flows from the front end of the cylinder 95through the pipe 200, valve 19 and pipes 20| and 202, back to the tank|18.

The motor 91 for shifting the rear end of the machine frame relativelyto the rear Wheels, is controlled by `the valve 203 to which the lever|82 is connected. When the valve 203 is in its full line position asshown in Fig. 9 liquid Will be forced through the valve into the pipe204 and the cylinder 91, back of the piston therein. At the same timeliquid ovvs from the cylinder into the pipe 205, valve 203 and pipes 206and 202, back to the tank |18. Both of the valves |19 and 203 may bemoved to their respective dotted line positions to reverse the motorscontrolled thereby and each motor may be locked in adjusted position, byclosing its controlling valve.

The mold board shifting motor |44 is controlled by the valve |86 towhich the actuating lever |85 (Fig. l) is connected. is in its full lineposition liquid will be forced from the pipe |90 into the pipe 201, thevalve |86 and the pipe 208, into the cylinder |44, back uid will beforced from the other end Of the Cyl- When this valve inder |44 into thepipe 209, through the valve |86 into the pipe 2| 0, and thence back tothe tank |18.

The lifting hangers are operated by the motors |39 and |40 to which areconnected the controlling valves 2|| and 2|2 respectively actuated bythe levers |83 and |84. When the valve 2|| is in its full line positionliquid will be forced from the pipe |98 into the pipe 2|3 and throughthe valve 2|| into the pipe 2|4 and thence into the cylinder |39 aheadof the piston therein. At the same time liquid will be forced out of therear end of the cylinder |39 into the pipe 2|5 and through the valve 2||into the pipe 2|6 back to the tank l'|8.`

In a similar manner When the valve 2|2 is in its full line positionliquid will now from the pipe |98 into the pipe 2|1 and through thevalve 2|2 into the pipe 2|8, and into the cylinder |40 back of thepiston therein. At the same time the liquid ovvs from the piston |40into the pipe 2|9 and through the valve 2|2 into the pipe 220 Which isconnected to the suction pipe' |31. When the valves 2 |I and 2|2 aremoved to their dotted line positions the motors |39 and |40 may bereversed and when these valves are closed both motors are locked.

It should be particularly noted that the supply side of the pump |11 isconnected directly to each of the hydraulic motors. With respect to thepump |11 the motors 26, 95, 91, |39, |40 and |44 are connected inparallel to each other. The motors 31 and 38 considered as a pair orgroup are also connected across' the Ipump |11 in parallel With theother motors but the pistons of the motors 31 and 38 valways operate inreverse directions so as vto properly effect steering as indicated inFigs.` 2, 5 and '1.

A pipe 22| connects the pipe 220 to the suction pipe |81. The pump |11may therefore draw liquid from the return flow pipe 202 or from bothreturn pipe 202 and the tank |18. It is desirable to keepall of thepipes completely lled vvithv liquid at all times and the pipes aretherefore preferably so` arranged `that there Will be no drainage bygravity into the tank |18 from any of the return pipes.

Thecapacity of the pump |11 is preferably such as to enable the operatorto effect the operation of a plurality motors at theY same time.

For instance, he may control the leaning of thel front and rear wheelsat the same time by means of the motors 26 and 95. Furthermore, he mayin adjusting the mold board to a high lift or `bank cutting lposition,operate the motors |39,

direction of the arrow 224 to prevent stalling of ,any valve is openedthere will be an immediate response in the operation of the motor towhich it is connected, the controlling valves being adjacent to themotors, as shown in Figs'. l and 2.

`When the mold board is operating in bank cutting position there is atendency for themold board when it meets with an obstruction orunusually hard material to move outwardly away from the machine framewhile at the same time it is being thrust rearwardly. 'Ihe tubular guide|51 `therefore tends to slide off the slide rod |56. When the lugs |53are midway between the ends of the raclk bar l 52, as shown in Fig. 2,the latch may vhave to be placed in the last notch |52, whereas when thelugs 53 and |53 are located near the ends of the rack `bar |52, thelatch |63 may be located in a notch |52 nearer the center line of thedrawbar It will thus be seen that the angle between the center line ofthe drawbarV extending through the pivot |59 and the center line of theplate |53 extending through the same center, may be made greater whenthe end lugs |53 and |53" are used, and consequently for a given highlift position of the mold board harder work may be performed in banksloping position while maintaining all of the parts of the apparatusproperly connected and without subjecting them to undue strain.

While I have shown a p-ull type grader, it should be understood that myimprovements are also applicable to a road grader of the self-propelledtype embodying an internal combustion engine as the power plantconnected to the :rear traction wheels.

' Obviouslyv those skilled in the art may make various changes in thedetails and arrangement ofvv parts without departing from the spirit andscope of the invention as defined by the claims f hereto appended, and Iwish therefore not to be' restricted to the precise construction hereindisclosed.

Having Athus described and shown an embodiment of my` invention, what Idesire to secure by Letters Patent of the' United States is:

1'.Y In a road grader, the combination with a wheel supported frame, ofspaced-apart longitudinal rock shafts, a drawbar flexibly connected atits forward end to said frame, a road-working implement carried by saiddrawbar, radial crank armsextending laterally from said rock shafts,spaced-apart hangers pivotally connected at their ends to said crankarms and said drawbar, means between said frame and said drawbar forshifting the road-working implementlaterally relatively to said frame,spacedapart hydraulic motors pivotally connected at their lower'ends tosaid frame, operating connections between the upper ends of saidhydraulic motors and said rock shafts, and means for effecting operationof said hydraulic motors to actuate thehangers for co-operation withsaid shifting means to adjust the position of the road-working implementrelative to the frame and the road surface.

2. In a road grader, the combination with a wheel supported frame, oflongitudinal 'rock shafts journaled to said frame to occupy spacedapartpositions, crank arms extending radially and laterally from the frontends of said rock shafts, a road-working implement, a drawbar flexiblyconnected at its forward end to said frame vand carrying saidroad-working implelment, spaced-apart upright hangers pivotallyconnected at their upper ends to said cran'k arms and pivotallyconnected at their lower endsto said drawbar, two hydraulic motors oneconnected between the frame and one of said rock shafts and the otherconnected between said frame and' the other rock shaft, and means forcontrolling' the operation of 'said hydraulic motorsto operatesaidhangers individually to elect adjustment of the road-working implementand lock the same in adjusted position.

3. In a road grader, the combination with a Wheel supported frame, oflongitudinal rock shafts journaled to the sides of said frame and havingradial arms extending laterally from the ends thereof, a road-workingimplement, extensible hangers connected by universal joints at theirends to the forward crank arms and to said road-working implement,Vseparate hydraiilic motors connected at their upper ends by universaljoints to the rear crank arms and connected at their lower ends bypivots to said frame, and means for effecting the operation of saidhydraulic :motors individually and the locking thereof in adjustedpositions.

4. In a road grader, the combination/with a wheel supported frame, of adrawbar having its front end pivotally connected to said frame, aroad-working implement carried by said drawbar, and means comprisingspaced apart rack bars connected' by a gear for shifting laterally therear end of the frame together with said road working implementrelatively to the rear wheels of the machine.

5. A road working machine comprising the combination with a supportingframe, of a roadworking implement, a drawbar pivotally connected at itsforward end to said frame, a hydraulic motor mounted on said framelongitudinally thereof and comprising a reciprocating piston, andmechanism connected between said motor and the rear end of said drawbarto enable rectilinear movement of said piston to effect shifting of saidrear end laterally and thereby move the road-working implement laterallyof said frame.

6. A road working machine comprising a supporting frame havingspaced-apart longitudinal beams connected by a tubular cross-brace, of adrawbar p-ivotally connected at its front end to said frame, aroad-working implement carriedY by said drawbar, a transverse rack-barconnected to the rear end of said drawbar and mounted on said frame toslide laterally relatively thereto, a hydraulic motor comprising apiston in a cylinder pivotally connected at. one end to said tubularcross-brace, a rack bar connected to said piston to reciprocate bodilytherewith at right angles to said first-named rackbar, and gearingbetween said reciprocating! rack-bar and said transverse rack bar toeffect lateral shifting of the road-working implement.

'7. In a road working machine, the combination with a wheel supportedframe, of a drawbar pivotally connected at its forward end to saidframe, a road-working implement carried by said drawbar, .a transverserack ,bar connected to the rear end of said drawbar and mounted on, saidframe to move laterally thereof, and means comprising an additional rackbar connected to said transverse rack bar to shift the same togetherwith the rear end of said drawbar laterally of said frame and therebysecure lateral adjustment of said road-working implement relative tosaid frame. l

8. A road grading machine `comprising a vehicle frame, a drawbarpivotally connected at its front end to said vehicle, a road-workingimplement carried by said drawbar, a rack bar, guides for supportingsaid rack bar for sliding movement transversely of said vehicle frame,mechanism comprising another rack bar extending longitudinally of saidframe and connected t0 Said transverse rack bar to effect shifting',v

thereof in'said. guides and relatively .to said frame, and a connectionbetween said transverse rack |bar and the rear end of said drawbar totransmit movement of said rack bar to said roadwonking implement to eectadjustment of th latter relative to said frame. i

9. A road working machine. comprising the combination with a vframe, ofarroad-working implement mounted on said frame, a laterally shifting-connection between the frame and said road-Working implement andcomprising gear-` ing, and a `hydraulic. reciprocating motor mounted onsaid frarne` and connectedto said gearing to actuate `the same andthereby effect lateral shifting of the road-working implementcombination with a vehicle `having va supporting frame, of aroad-working implementcarried by said frame for adjustment laterally ofthe ve-` hicle, and means comprisinga reciprocating hydraulic motorconnected at one end to saidY frame and at the other end to gearingconnected to said road-working implement to shift the latter laterallyof said frame and hold the same in adjusted position while said motoracts as a strut to resist back pressure during operation of saidroad-working implement.

11. In a road grader, the combination with a Wheel supported frame, oflongitudinal shafts journaled to the sides of said frame and having armsextending radially from the ends thereof, a drawbar connected to saidframe, a road-working implement mounted on said drawbar, extensiblehangers connected pivotally to said drawbar and also connected pivotallyto two of the said arms on opposite sides of said frame, separatereciprocating hydraulic motors connected between said frame and theother two arms on opposite sides of said frame, and means for effectingoperation of said hydraulic motors individually and the locking thereofin adjusted positions.

12. In a road grader, the combination with a wheel supported frame, of adrawbar flexibly connected at its forward end to said frame, a moldboardcarried by said drawbar, space'dapart hangers connected to said drawbar,spaced-apart longitudinal rock shafts connected to said hangers, uprightreciprocating fluidpressure motors connected to said rock shafts,laterally shifting mechanism connected to said drawbar, .a reciprocatingfluid pressure motor connected to said laterally shifting mechanism toactuate the same, and means for controlling said motors to effectlateral shifting of said moldboard and adjustment thereof in elevationand inclination relative to the vertical.

13. In a road working machine, the combination with a vehicle, of a roadworking implement, a drawbar for carrying said road working implement,spaced-apart extensible hangers at the sides of said frame and connectedat their lower ends to said drawbar, spaced rock shafts at the sides ofsaid frame and connected to the upper ends of said hangers, tworeciprocating hydraulic motors one connected to one of said rock shaftsand the other connected to the other roclk shaft, means for controllingsaid motors individually, a laterally shiftable device at the rearportion of said frame and spaced rearwardly from the rear end of saiddrawbar, an extensible connection extending rearwardly from said drawbarto said laterally shiftable device, said connection being pivoted to therear end of said drawbar o-n a horizontal axis-and means for actuatingsaid laterally shiftable device in co-operation with said motorsconnected `to hangers of adjusted lengths to secure adjustment of theroad working implement in elevapressure motors connected to said rockshafts for individual actuation thereof, a laterally shiftable devicemounted on'said frame, flexible connections extending rearwardly fromsaid drawbar to said laterally Vshiftable device, `a pump mounted o-nsaid frame, an engine mounted Von' said frame and connected' to saidpump to operate the same, means for shifting said device laterallyrelatively to said frame to effect lateral shifting of said moldboard,and operator-controlled means for connecting the pump to either fluidpressure motor to effect adjustment of the moldboard in elevation and ininclination transversely of the roadway.

15. In a road working machine, the combination with a vehicle frame, ofa drawbar flexibly connected at its forward end to said frame,spaced-apart hangers pivoted at their lower ends to the free end portionofsaid drawbar, spacedapart rock shafts mounted on said frames and eachhaving laterally extending arms at their ends, the arms at the forwardends of said rock shafts being pivoted to the upper ends of saidhangers, reciprocating uid pressure motors pivotally connected at theirlower ends tosaid frame and pivotally connected at their upper ends tothe arms .at the rear ends of said shafts, a moldboard carried by saiddrawbar, and means for controlling said motors to effect lifting andlowering of said hangers individually to adjust the elevation andinclination of the moldboard relative to the roadway.

16. In a road grader, the combination with a wheel supported frame, ofspaced-apart longitudnal rock shafts mounted thereon, a drawbar flexiblyconnected at its forward end to said frame, a road-working implementcarried by said drawbar, crank arms extending radially from said rockshafts, spaced-apart hangers pivotally connected at their ends to saidcrank arms and said drawbar, means between the said frame and the rearend of said drawbar for shifting the road-working implement laterallyrelatively to said frame, reciprocating hydraulic motors pivotallyconnected to said frame and to said crank arms, and means for effectingoperation of said hydraulic motors to actuate the hangers forco-operation with said laterally shifting means to adjust the positionof the road-working implement relative to the frame and the roadsurface.

17. In a road grader, the combination with a wheel supported frame, oflongitudinal rock shafts journaled to said frame to occupy spacedapartpositions, crank arms extending radially from the said rock shafts, aroad-Working implement, a drawbar flexibly connected at its forward endto said frame and carrying said road-working implement, spaced-apartupright hangers pivotally connected at their lower ends to said drawbarand pivotally connected at their Sil upper ends to 'twoiof said crankarms one onA one rock-'shaft and the'other on the other rock'shaft.'

ofVr said hydraulic lmotors individually to effect adjustment of theroad-working implement and the locking of the same in adjusted position.

185A road-working machine comprising a supporting frame,A of aroad-working implement adjustably-mounted thereon, arrack bar mounte'dv"on said frame and connected to said road- Working implement, anadditional rack bar, a duid-pressure motor connected between saidframe'and said additional rack bar, and gearingbetween said rack bars toeffect upon operation'of the motor the adjustment of the roadworking'implement relative to said frame by shifting said first-named rack barrelatively toisaid frame.

19.In aroad-working machine the combination with a Yvehicle of aroad-working implement adjustably mounted thereon a laterally shiitabl'eVdevice.""mounted on'said frame and! connected t Esaid' 'road-'Workingimplement a 1-e-"V ciprocatingniotor operable in a; directiontransversely. of' said-'laterally shiftable device, and operatingconnections between said motor and said device for effectingshifting ofthe latter laterally of the franieupon operation of said motor 'to`adjust said `road-working implement relative tor-'saidframn` f 20. In a'device 'of the class'described, the comable mem'berto eiect adjustmento'f the latter` relative to said'vel'licle:`

